SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0797f5f1a83a5bd31b24e269c75c4e749a32947449184cf53c4e100b851e2f' 
  AND token = 'LYGx8bAj+X/x3vG/e7qrHJF0uQFdb4KPxoyaQQBqvIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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