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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507c977deb78dc439e7e88d75f2e433f5637fe88b97e0f6c85eae6eeb64f7708' 
  AND token = 'ZK2nB6gNhcCc/rmhR4tZPb1Ukn4VwrW5i5dF5Cqm1sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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