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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eff5247c04fef8f75b4e86848dc2cedbabb159b41705cc9b9dfe782dbecc0db' 
  AND token = 'IxnNTk0SQJbMRfuEAu5wERoSObnzHdY79P8U8xvnOQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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