SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ba8b70e46e3385b2d5e7841105e91df97b2d69a531977a20707b3767138b85' 
  AND token = 'Xysj5kJRV1STG+09Qnv3SBUYHVjGm7zYBuxKGf7eWhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}