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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb85c1d9ed9471060373f81cedc7e2f1b7772fc3e607b5f130c04bdf0e59b29' 
  AND token = 'CHubDO/N5bNINYUGEi2vDhMRKrpUUX/b+/tnfiGxcj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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