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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1be509b694452ae83edbfa28627acf1a0df2e1fbce3004d2398e9bf4c5e0ea2' 
  AND token = 'MsUU9qBLboHHhCsXQVEsLEtz1KVK9bNPCP3bCuFAfc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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