This addresses the MySQL syntax error regarding the lock table. On older
osTicket databases we didn’t enforce having a prefix on the db tables.
This means the lock table name would be 'lock' instead of 'ost_lock'. Cron
runs an `OPTIMIZE TABLE` query on the lock table and if it has no prefix
the query reads `OPTIMIZE TABLE lock;`. This is an issue because 'lock' is
a MySQL Reserved Word and will throw an error. All you have to do is
escape the table name with back ticks and MySQL won’t throw an error.