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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4627555299073263e79e30ffa4ea29f7b968d9c0049f8a3d8af73ac3ef6052d5' 
  AND token = 'CiwW4Tu2QxQvPHotUErn2tOMq9wi+xHQr4cV9gwKWvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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