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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cd036950ba4c53a06dcdefa8eb5ee23ddb505c76e5242c13bb0c6746f26ac3' 
  AND token = '488cj3q7Yb0PtC/6rLg7jQ4advPdzR1DX77BNbN+Psc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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