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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26f1ac4f98a4e4b246d530b8bb8c540fd47e28d6f22eae7dcb68a50c20f61fa' 
  AND token = 'WBxhIR7zTaWyJum4sHMA60mKyvMvGC8D1lFsRCy/FgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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