SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636274cbb413c902a3853bc7cdca475ff9eea33b8bc3a3d676bad49f38200ded' 
  AND token = 'IYHhMBaKYPWgsZPqwwDfsycLJuFGIMAvCH1E8vleb1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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