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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715707eb54886fd3d1e2b91d19cf3a01f5614ca0148f946d7af6d5649d408d5f' 
  AND token = 'VkJAv6mWMsOpGZ4SlNOM2tI5THLCJ96y12mQghQ8EVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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