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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33ab68b45bd4d53b44c5ca4451081763d4ec036046821eb6a89ebd50c51ac59' 
  AND token = 'MkUxo0UCbXrjV5Zuq4aQTOlTY9N7Rh2pFcyLCJqZuWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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