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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf769fc0af0e2ce495b26e1bf46b97d57414c97d926b5d830e27c0a0efd97f9' 
  AND token = 'G0ODfMZZD0Iz7PkSuuyO/JaqWIrhnM/LfWaF/wjgSR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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