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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc7a3cebac4fcfac9efd56276b6d31cfbfb5c0327d58b12b950229a5ccc9f6b' 
  AND token = 'Q+C+z39XMgqTIimD+XHGOba9vCouwca27dWPzVy4MPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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