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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a2cf56f34409c8f18a01400ab2bd3ac97722144ee2fd3e3b900e89167a8d3c' 
  AND token = 'JXHbKOe9UijAC80Vgh/lsACJvWEvREfo/GBTAaSpM+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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