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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ebd3b8823335e68a78483475b6de68288fabcbdb2009127e0b6c0b74054289' 
  AND token = '7vT0WMImQoY+9GGOloy8ePQdet6yBDPlnYU1uWdFkDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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