mysql> SELECT now();
+---------------------+
| now()               |
+---------------------+
| 2014-09-17 10:44:53 |
+---------------------+
1 row in set (0.00 sec)

mysql> insert into event (name) values ('test');
Query OK, 1 row affected (0.00 sec)

mysql> SELECT * FROM (     SELECT         table_name,         IFNULL(update_time,create_time) LastTimeTouched     FROM         information_schema.tables     WHERE         table_name = 'event' AND table_schema='test') A ORDER BY LastTimeTouched LIMIT 20;
+------------+---------------------+
| table_name | LastTimeTouched     |
+------------+---------------------+
| event      | 2014-09-16 08:27:41 |
+------------+---------------------+
1 row in set (0.00 sec)