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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfee6a494faf887b0ed15904c0d20f2dec29c68a92d6a6a1e30fc092c3af415' 
  AND token = 'KL3XcVl6AjuuCjL4HOdmy3WMdoyyt+YXNjZJ4AzPQXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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