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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e654f13f6c08f1d9b732e419411559db5ec68faa4b4e1b10a8526806d5ff94' 
  AND token = 'vX2ZUCugLrD550NmylbX4fHtnHkWKv/tfU2UhkY0txs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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