SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b6855539a5794e262c657b08ad5a0f8aca5e1c93562086165b3fd748e34d5b' 
  AND token = '3EFcV+TpsbWahfaxxm01L7aCOZYq3M2jIWdjOBEIAAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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