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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf97683acea5f83b5656442ffc582d3b0a25727ffa51491a70ebd76bc6e239c' 
  AND token = 'tMgEjv/ka8zVo/XO18QTbmvTt14A80ewijIIqqfyydo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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