SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b12400fc658713fa051ba201caf91e1438b07ebda92b5599af1ebcfd4748ac9' 
  AND token = 'ccccA8qomQoO3YuuAjPRjQIs0Qg+AI7WRPciNUlSdRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables