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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f68ec6c7635a8772b848557cda9c6b015ea8ecf7e6334c9dab7fb492efd160' 
  AND token = 'OcFfGbES8BJCXGvNHL4m3Dn4XNT6bIb0C7mQZygwH6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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