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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90245b158b851f491491044691580cc6f9120ac016b614632a6d93e0dcc0924f' 
  AND token = '9WxyOa82KI6kHYD7ya1fFxaKV4Qp4CIG1xgEUsImxyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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