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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd6e574f893e4e487d1cb3ea89226beb13b407956e31e593cd010b334d0fd0d' 
  AND token = 'xga05E7R0mgMNpBYaC8b8Ib6yWpZZNRGvK7cesdJZuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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