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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eedeb495f30366e4c4cbfe7676a5f0d6407822c3fa5dacc6c25bed2a2db3aa5' 
  AND token = 'Gtifg46eUagC25uBaV7qIDDKvUhXyqKxfy5hfi0KX0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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