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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3224b92546522b79fb22449593afc3d5394d334a4520d33ce98c829128c7d8' 
  AND token = 'dedTdrm9o/VTOeT+Wl53bXf/dvJRxUt93VbzutqL37E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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