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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f9472ee1292184147d57eedd86d8add3e303335bdc4339e31ec6ac78c89967' 
  AND token = 'FPKDilaLzV+DoMydjKPPl4AqwD2Eill5GncGwFbEDbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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