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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113e2b7c316922d07102cf55d1adb07113d753ca673d79ac418207a338f5e6d5' 
  AND token = '+vLpPERymyTAAAcUzcvds8K6vwcrRf0F9PGi5VJY9f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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