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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73ec28240e62c110e26df1b825a286259224b60ca3fc75db404b3080519cd3d' 
  AND token = '3xNAllKe/mhf+QCusa+xvimdZqnS0+tErtOGjbZrAa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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