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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6cfc45b638213caead938b4443adce3cc6dc0f5227193152c9fd210e228ea6' 
  AND token = 'YL6fCsN8H59ZCuG54957XeZBncx95G6LhtAD+Z0f5Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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