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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b842808628c6071d771266842b698546b7ee2b2ec627e9bd894ac54a5958fa' 
  AND token = 'yt447aQxIavMNhMTxGVUiNQERjcaHO3a8iOgucgD/6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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