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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797a43e17d77934e76f350b773be1a2b5fa48d518a7b3ca2f5c6c2b8a6e4ee21' 
  AND token = 'BI8lFxz3Rn6u6C/h6jRTMvGzsEJS/rithBTM3DkQENE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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