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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f942d036e761d9c0dd32b9bec2315b17cc71c33ed8440fb858a3fc2688e51533' 
  AND token = 'HstQGydvyXfq39XwkqIu3ikMaLO/rSrHj5gbtj7Fobg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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