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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658cfe3ab42dcfec9333bd2010e76f977cf6eec35798e608ed883e6feadc3304' 
  AND token = 'WgO/sW4/zQQd+bH32YxuDJAxAlZRJJdQLFwagPRA13M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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