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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef58743da435aab386f57beabc1fd275f3c19ae5239bfc292f635a8c9fd79a2e' 
  AND token = 'PTFdMeTDIz3vibllYZ2LFE67v6w+JDYZwlC+dAQuKuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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