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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303a4c069a3834661619553d8eadd29214ececeda3391788dd952df35c6e7a64' 
  AND token = 'UPGRfbdtJ1nOdeMI9xWYF9b5PlIJqYTuax6hEWzP+Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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