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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59dd7039b587135008f7a00cb54fb16c1cd7b58f86c4420d890431cf8211697e' 
  AND token = 'ueeJGBY/2WLHQbkVyqKF4L79B8VQ7h7u/Yj8t81XeyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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