SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb2be2390d509ddbc075f189d26834a684860ee7b6152a4a41f3f6308107433' 
  AND token = 'cVw+894/QQO2jYo9AVzBBwuxZtzP2FRt9gElVmgG5co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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