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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a58e3dc5ac194692dd1643f033dd5503c86cffdf1765f416398943dfa4951e' 
  AND token = 'tg6Rz1QN61ZM660YXIkJcGTlZaS/uBvymWc6bMCb9G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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