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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a65e5c1c9c920a43dfe6b2da2a9417af4e54fd6d9164f3a5d78b52c8c39475' 
  AND token = 'Yeo41FubJ0jcOc5mw08h0ZfN6cd6nupx8ZA8bN/HHWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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