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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4257654958a62997d3cb07fc49efb7a2f316fb09a92e6af4a21ba1434de5af' 
  AND token = 'TLp9tTp1zgoQawe2qhBzBBEySW7sSJaNWdTGkbCNG4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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