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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50fa1e34e0410b8d3034272d9bf13319a62b7cd8c7dbe766460d95d90a49fbae' 
  AND token = 'nKwXkuTKslFwuJdPZCl+oaLsVIHky4X26D5kXaveO0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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