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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18e03b36f5053a629320d07b82683c2734b3c36e1bbd574f7d0bf318ce8a766' 
  AND token = 'SBKMgZcUl11D5adnRNZo1ukS0u24TdgJh4XRzrN5GiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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