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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da55bd799a7f5ad9b54da67e849baabda56a6f60afffdc18d7fbd3d21e491f74' 
  AND token = 'ZaobXai6Q780pyu7Hr3xTUM58p19cpr8gCXkvnWwNPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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