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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9b84e1db39dd5317918736b87c451d6d2047b98d8d2464e8d308b496e71e80' 
  AND token = 'c2lmD1YLpfSRx0K9PJ2j5F6Kre1TeH41JSrygNyMnzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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