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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca4989fb40fcdae2b9ea6eb33f52636b75f2e2a27a5c899952dbfbb675d3ae6' 
  AND token = 'JsBUskuYN038WcfH1McMTjuKZm9P6Tnn8WgW48lnIow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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