What would be the best way to combine the following 2 queries?

SELECT divisionName AS lab, divisionID AS id FROM KSComputerDivisions;

SELECT max(usageWhen) AS start, min(usageWhen) AS end FROM KSUsage
    LEFT JOIN KSComputers ON KSUsage.usageComputerID = KSComputers.computerID
    WHERE KSComputers.computerDivisionID = 65530 AND usageEvent = 16;

So that I would get output looking like:

id | lab | start | end |

I came up with this: 

SELECT max(usageWhen) AS end, min(usageWhen) AS start, KSComputers.computerDivisionID AS id, KSComputerDivisions.divisionName AS lab
    FROM KSUsage
        LEFT JOIN KSComputers ON KSUsage.usageComputerID = KSComputers.computerID
        LEFT JOIN KSComputerDivisions ON KSComputers.computerDivisionID = KSComputerDivisions.divisionID
    WHERE KSComputers.computerDivisionID != 'NULL' AND (usageEvent = 15 OR usageEvent = 16)
    GROUP BY KSComputers.computerDivisionID;

However it is very slow (7 seconds).

Doing seperate queries, 1 to grab the lab id's, and then a separate min/max for each lab would take approximately 3 seconds.

###################################################################
# Here is output from the queries as well as explains
###################################################################

mysql> SELECT max(usageWhen) AS end, min(usageWhen) AS start, KSComputers.computerDivisionID AS id, KSComputerDivisions.divisionName AS lab
    ->     FROM KSUsage
    ->         LEFT JOIN KSComputers ON KSUsage.usageComputerID = KSComputers.computerID
    ->         LEFT JOIN KSComputerDivisions ON KSComputers.computerDivisionID = KSComputerDivisions.divisionID
    ->     WHERE KSComputers.computerDivisionID != 'NULL' AND (usageEvent = 15 OR usageEvent = 16)
    ->     GROUP BY KSComputers.computerDivisionID;
+---------------------+---------------------+-------+----------------------+
| end                 | start               | id    | lab                  |
+---------------------+---------------------+-------+----------------------+
| 2007-06-13 10:31:15 | 2005-07-11 09:49:16 | 65522 | TEOCAT               |
| 2007-06-13 11:26:39 | 2004-12-02 12:50:51 | 65523 | Satterlee 300        |
| 2007-06-12 11:56:01 | 2005-03-30 12:13:25 | 65524 | Old Levitt PCs       |
| 2007-06-09 16:00:24 | 2004-10-25 13:51:31 | 65525 | Crumb Macs           |
| 2007-06-12 12:29:34 | 2006-02-17 10:09:00 | 65526 | Crumb Notebooks      |
| 2007-06-13 11:08:14 | 2005-08-15 19:51:45 | 65527 | Satterlee 325        |
| 2007-05-21 17:31:18 | 2005-08-12 13:18:21 | 65528 | Modern Languages Lab |
| 2007-06-12 16:47:58 | 2004-08-27 10:33:02 | 65529 | Levitt Macs          |
| 2007-06-13 08:49:05 | 2004-11-30 16:42:36 | 65530 | Kellas 100           |
| 2007-06-12 19:45:41 | 2005-08-16 16:55:22 | 65531 | Podia Macs           |
| 2007-05-21 12:01:16 | 2005-08-29 01:01:19 | 65532 | Flagg 162            |
| 2007-06-13 11:27:08 | 2006-04-12 10:58:07 | 65533 | Crumb Reference Area |
| 2007-05-10 17:21:54 | 2005-03-18 07:55:54 | 65534 | Morey 114 Laptops    |
| 2007-06-13 11:25:21 | 2006-05-31 09:47:37 | 65535 | Levitt Center (PC)   |
+---------------------+---------------------+-------+----------------------+
14 rows in set (7.40 sec)

mysql> explain SELECT max(usageWhen) AS end, min(usageWhen) AS start, KSComputers.computerDivisionID AS id, KSComputerDivisions.divisionName AS lab     FROM KSUsage         LEFT JOIN KSComputers ON KSUsage.usageComputerID = KSComputers.computerID         LEFT JOIN KSComputerDivisions ON KSComputers.computerDivisionID = KSComputerDivisions.divisionID     WHERE KSComputers.computerDivisionID != 'NULL' AND (usageEvent = 15 OR usageEvent = 16)     GROUP BY KSComputers.computerDivisionID;
+----+-------------+---------------------+-------+------------------------------------------------------+-------------------------+---------+------------------------------------------+------+-----------------------------------------------------------+
| id | select_type | table               | type  | possible_keys                                        | key                     | key_len | ref                                      | rows | Extra                                                     |
+----+-------------+---------------------+-------+------------------------------------------------------+-------------------------+---------+------------------------------------------+------+-----------------------------------------------------------+
|  1 | SIMPLE      | KSComputers         | index | PRIMARY,computer_division_id,computer_id_division_id | computer_id_division_id |      69 | NULL                                     |  599 | Using where; Using index; Using temporary; Using filesort |
|  1 | SIMPLE      | KSComputerDivisions | ref   | PRIMARY                                              | PRIMARY                 |       4 | keyserver.KSComputers.computerDivisionID |    1 |                                                           |
|  1 | SIMPLE      | KSUsage             | ref   | computer_id,event_other_time,usage_event             | computer_id             |      65 | keyserver.KSComputers.computerID         |  655 | Using where                                               |
+----+-------------+---------------------+-------+------------------------------------------------------+-------------------------+---------+------------------------------------------+------+-----------------------------------------------------------+
3 rows in set (0.00 sec)

mysql> SELECT divisionName AS lab, divisionID AS id FROM KSComputerDivisions;
+----------------------+-------+
| lab                  | id    |
+----------------------+-------+
| Old Levitt PCs       | 65524 |
| Crumb Macs           | 65525 |
| Crumb Notebooks      | 65526 |
| Satterlee 325        | 65527 |
| Modern Languages Lab | 65528 |
| Levitt Macs          | 65529 |
| Kellas 100           | 65530 |
| Podia Macs           | 65531 |
| Flagg 162            | 65532 |
| Crumb Reference Area | 65533 |
| Morey 114 Laptops    | 65534 |
| Levitt Center (PC)   | 65535 |
| TEOCAT               | 65522 |
| Satterlee 300        | 65523 |
+----------------------+-------+
14 rows in set (0.00 sec)

mysql> explain SELECT divisionName AS lab, divisionID AS id FROM KSComputerDivisions;
+----+-------------+---------------------+------+---------------+------+---------+------+------+-------+
| id | select_type | table               | type | possible_keys | key  | key_len | ref  | rows | Extra |
+----+-------------+---------------------+------+---------------+------+---------+------+------+-------+
|  1 | SIMPLE      | KSComputerDivisions | ALL  | NULL          | NULL |    NULL | NULL |   14 |       |
+----+-------------+---------------------+------+---------------+------+---------+------+------+-------+
1 row in set (0.00 sec)

mysql> SELECT max(usageWhen), min(usageWhen) FROM KSUsage     LEFT JOIN KSComputers ON KSUsage.usageComputerID = KSComputers.computerID     WHERE KSComputers.computerDivisionID = 65530 AND usageEvent = 16;+---------------------+---------------------+
| max(usageWhen)      | min(usageWhen)      |
+---------------------+---------------------+
| 2007-06-13 08:49:05 | 2004-11-30 16:59:12 |
+---------------------+---------------------+
1 row in set (0.35 sec)

mysql> explain SELECT max(usageWhen), min(usageWhen) FROM KSUsage     LEFT JOIN KSComputers ON KSUsage.usageComputerID = KSComputers.computerID     WHERE KSComputers.computerDivisionID = 65530 AND usageEvent = 16;
+----+-------------+-------------+------+------------------------------------------------------+----------------------+---------+----------------------------------+------+-------------+
| id | select_type | table       | type | possible_keys                                        | key                  | key_len | ref                              | rows | Extra       |
+----+-------------+-------------+------+------------------------------------------------------+----------------------+---------+----------------------------------+------+-------------+
|  1 | SIMPLE      | KSComputers | ref  | PRIMARY,computer_division_id,computer_id_division_id | computer_division_id |       5 | const                            |   23 | Using where |
|  1 | SIMPLE      | KSUsage     | ref  | computer_id,event_other_time,usage_event             | computer_id          |      65 | keyserver.KSComputers.computerID |  655 | Using where |
+----+-------------+-------------+------+------------------------------------------------------+----------------------+---------+----------------------------------+------+-------------+
2 rows in set (0.00 sec)

Thanks!