SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9950b64c1557f818c0b1d40bff45a5a1fa8fcccc3f996710533d7603be25c30' 
  AND token = 'Xu3Cv3sV9rHQ7WBcdq919LezK7yq+SJhf//QttVQky4=' 
  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