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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470ad7cef10ae493d93377a3e318fb00e15c27d23f03a33b8188eac4845c35cb' 
  AND token = '/OjTX4kAnMkK5NWHvVfhmtwl4bqIX2azvwGoVEKrukY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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