SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b23463c0ecc85d599445753f46db34117252d3a4661bd1687e8997cb15069b' 
  AND token = 'FXn+UeLifYq/48Dk9NNN0sDhOeqrsSibv+/N96ckiyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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