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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5581847952db951203560678d9a1ae92f1c4dded97deec456929de9f35a63032' 
  AND token = 'Sz1IdXbITPV+MZUUmKeRt4r4O+/92r6vifD3b0eexik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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