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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d071e95e43e895748cbf09334c9a562232193f7b9a946006faa2979229f4ae' 
  AND token = 'XLC1WE871Wn+Frdcp9qOUz2W3d1ar2vCi/Sa3jTh9cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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