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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c83de6ce00dd98d2c7a5014759af7954004ffabebcd87234408d6c35d8e280' 
  AND token = 'HA1ZNLk7jh62jfczc3keQjG4kWBhxQ9Oq57SLMiLEfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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