SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1484ad418ec186a3a270d7e13899e9d27288e4e3c4b1d9df3365f1020f7146' 
  AND token = 's2x/dnpApRSvI/VDgqOUITrVcqRqZAMiRfw+zJIF4PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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