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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256e45a1167ea3f7fdffd0482959a382ed0784c9ea7ef6d484de74f34b801612' 
  AND token = 'xR1b0j6GW7Er0mlDg2G69aPif3roW5GvHNXPyL7jQlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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