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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c98d741fb552a3384cc2d974bac794d99de0a3f22deeda219e8dc7d52965f0' 
  AND token = 'vHn47JInrJRxk48j/rEZa4N6xWikCrPd/LKh1lFXF2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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