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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ec02bc498f0af5e2ae4c748f374c32822f212d5d05dd66921869149c883bd0' 
  AND token = 'rNGdQLe1Ge7AHFtFo+UUpp23GtmoB1UM1kK61x0SFmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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