SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19b41c23bdf743400d30d730dcf649d52e52a2ad887d43055e09db076ba14f6' 
  AND token = 'yUpFEsUI/GUqsg0OYZCj+mMJk7hNuXYgOisAYAJNjwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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