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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b61b8023821334ebcbed2e2bd27e637c31f09439e16ad5f7dcbd29e0818761d' 
  AND token = 'GRbKckz4dBUScCxs3jHftqctDmvaMqQe//516EnbLvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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