SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18fdcf36e833b614513ec91005c89d8c29fbea346e34a9d74291e5c2d2f17a08' 
  AND token = '9yDhmBc45+LZZwe5T4qGo/xV8iQkkFjnozMJOynyh9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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