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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2667e8628ea88cba041179023903f3bf31c9dec2eafd957b214af3464b1e3d' 
  AND token = 'AoYua94ZQLFF4Mkx8YIzhq9jOTI8D3LdL3jhqAqWSnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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