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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8bec0f16bc93d095e7664dfd6f4f4386be78e04e4ab39474f9f2d8450c20c0' 
  AND token = 't88t1/a1I/zj8UBefLnncJG3/yOByCaQcmsRUuWbHLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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