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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d40b1b1d7881fce0cbe00128ff3fa2ea2172b71d8dd2f5b1877fcc325a97dae' 
  AND token = '462EPOv3u95Y7hBgEG7t44Znn0l0uwZXr9lhIx5ZAEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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