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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b419d179e693a442b218c445907c4752e9934bbc156c92959db31e0846d059' 
  AND token = 'L3WCK+UHebGfwM0zv8v+miLLTNr7kripCI2cyc2xci0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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