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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9169e5de4cd2708358066ff617ec39ae32a89233807e7790e158cc084ebe9f02' 
  AND token = 'kqMXlRdq3BC3WxwxDklqJbgaX8mtUuu9OxZcO2d+rcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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