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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb987cb95088ed5b03ad4e18d9100330c2effefe2248ceaafbd3863f997e5f6' 
  AND token = 'ipMY5TT45SjayIFY8PJaVJ/y6gm17WYg+HFOj68QmYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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