SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f5550ace28b8f5e72716aa3fb31dc90ce3502847989843e00ad4358a8258ab' 
  AND token = 'Hjfg5bJbzz1Fz0hrtnv+OyS6p+LTrIBvhQP6l/CvsRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}