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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f12eaae68f3860c6d3f09367299a5edf7c71ed5b359965398ccccab10673a64' 
  AND token = '/nSzPnHKgb2DnCDn0f1jqjxCERMeB26n7N00nXe2Aw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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