SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d32beec2ddc33945ce13768cea90e4531973dd94f7ef109c847d9c4e78b4748' 
  AND token = 'hY+w/KJac3kCCqXb/blaG2IzVtbRj5Dy4Y1uVlwiXrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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