SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11633436a2de1d5095d756fe1cb21256efed197d9ff415379ff04c4bc611173' 
  AND token = 'XLjGtXAyo+wirVYnpv/dK4zwhYoxke6QRB1ZgFDjikw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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