SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb490049369baa76099894e33fbef64831c0ac09433497431afe72469a5b9d9' 
  AND token = 'he15acpL0iRGqi8TFhyVPUF/uw0pSguyowsmShO6RfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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