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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a64968086f87ee0b6ebfa0f66861911588fe2b76de2fde46663ea455ff38df5' 
  AND token = 'ERYeO/5zPkh/rILa80yjJS9KW3XtxlkTpQ3DDP6LHis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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