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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b06c7a4944da7a48f979f5f24142c552ce3a9b0a843a10d7773798128d868e' 
  AND token = '3gGWYV7QynhlOE+xI+xmbk7E4CUB1t8xafn+9JCVUyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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