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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58b3729ba402bf0229c0cba2e407edea32a35ae7913b84a546144efdfb45213' 
  AND token = 'zECSV9PWrUKH/jxWvJLrohM4X8dWMc2WPcgEj/609K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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