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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8efdef462e8a9a8c892cacb8c13183e75f59421656564bfc7d7614aeefe8b8' 
  AND token = 'ce+JJUo1yFYCxI5EPh9TqPNvE4xNuRIJNx52JenRnNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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