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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568a8c0d7103e296ba10b726ff2b00c189570cbf1abfb7ccf507ada8fc1fc386' 
  AND token = '2bRdK8UFzi5ZzEPep6XrZb1+lt5zamL94ZdGl13G3u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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