SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f5e585262f98f19f0c99e5b159239ee810578e89b5604ae3cbaf5a9174b943' 
  AND token = 'oaBRQseFwO7kURjmKmXhqYPdxSptL5xZX/886KHkUTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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