Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0abf2eeaf2c8dada13ba75c7d0f07f84274e914a02e7a63f54b9d73f26b114' 
  AND token = 'SzFDeaKdk/x9f2Fd9WVZz+lCQDGbqcTw95YIe3Uprko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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