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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb6cc7156541d6946a5f647b6051d60522556771d6bc7ebdff4acb02660c5c6' 
  AND token = '/Ux16S4CHplNZjr3vhG5Fuu//yYN1KVhcbGaH0uTV2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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