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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab6d971d4653e1906ae744b44e2504289760b789b5fc365e0577975eab99e92' 
  AND token = 'ibdRX/gvlCES5PnurPnRT3dfoWX9e4i5ci5DLgxo09E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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